Harvesttide Sentry is a common Creature — Human Warrior card from Innistrad: Double Feature (DBL), collector number 186. Current market price: $0.05 (foil $0.32), TCGplayer market prices via Scryfall.
Coven — At the beginning of combat on your turn, if you control three or more creatures with different powers, this creature can't be blocked by creatures with power 2 or less this turn.